Door lock



Nov. 15, 1960 w. v. SCHWEITZER DOOR LOCK Filed Aug. 15, 1957 "2 Sheets-Sheet 1 INVENTOR. Wan/7n 1 Saw wzv 7 22:)?

a a V K a a M a 4 a 5 Z a 6 A I 5 I a Nov. 15, 1960 w. v. SCHWElTZER 2,959,953

DOOR LOCK Filed Aug. 15, 1957 I 2 Sheets-Sheet 2 I351. f. 7 a

/'IIIII?YIIIII'I'IIII4 arrow/07V United States Patent noon LOCK William V. Schweitzer, New Britain, Conn., assignor to The American Hardware Corporation, New Britain, Conn., a corporation of Connecficut Filed Aug. 15, 1957, Ser. No. 678,371

12 Claims. (Cl. 70-146) This invention relates to a door lock and more particularly to a door lock of the type manufactured and sold under the trademark Unit andwhich is primarily intended for use on the doors of dormitory bedrooms and public lavatories.

The primary object of this invention is to provide a door lock in which the outer knob shank may be rendered inoperative either by pushbutton actuated dogging means operable from the inner side of the door or by key operated dogging means operable from the outer side of the door, and in which said pushbutton actuated dogging means may be released, to permit operation of the lock, by said key operated means.

A further object of this invention is to provide a door lock having two separate dogging mechanisms for dogging the outer knob shank, the first of said mechanisms being operable by said pushbutton from the inner side of the door, and the second by said key operated means from the outer side of the door. 9

A still further object of the invention is to provide a door lock having a key operated cylinder lock in the outer knob which is adapted to control the second dogging means and also to operate the lock to cause the release of the first dogging means.

Another object of the invention is to provide a door lock of the above described type having means therein preventing accidental locking of the outer knob shank by a person leaving the room; the means by' which this object of the invention'is accomplished being generally the same as described in my United States Patent No. 2,797,949, dated July 2, 1957.

Further objects and advantages of this inventionwill be more clearly understood from the following description and the accompanying drawings in which:

Fig. l is a plan view, partly in section, of a door lock embodying the present invention and showing said lock in normal unlocked condition.

Fig. 2 is a fragmentary, plan view of said lock, partly in-central horizontal section, further illustrating the lock mechanism.

Fig. 3 is an exploded isometric view illustrating some of the parts of the lock which are incorporated in the dogging mechanisms.

Fig. 4 is a fragmentary, elevational view of the lock mechanism, partly in central vertical section and on an enlarged scale, illustrating the lock in normal unlocked condition.

Fig. 5 is a sectional end view taken on line 5-5 of Fig. 4.

Fig. 6 is a similar view taken on line 66 of Fig. 4 and illustrating the key operated dogging means for the outer knob shank of the lock.

Fig; 7 is a sectional end view taken substantially on line 77 of Fig. 4.

Fig. 8 is a sectional end view taken on line 8--8 of Fig. 4.

Fig. 9 is a view similar to Fig. 4, but showing the pushbutton actuated dogging meansin dogging position.

Fig. 10 is a view similar to Fig.5, but showing the mechanism when the key operated means in the outer knob is operated to release the pushbutton actuated dogging means.

Fig. 11 is a sectional end view on line 11--11 of Fig. 9 further illustrating the mechanism when operated to release said pushbutton actuated dogging means.

Fig. 12 is a view similar to Fig. 5, but showing thelock mechanism when the key operated means in the outer knob is rotated to operate the dogging means in the outer knob shank.

Fig. 13 is a view similar to Fig. 6, but showing the key operated dogging means in dogging position.

Fig 14 is a view similar to Fig. 9, illustrating the means incorporated in the lock for preventing accidental locking of the outer knob while the door is being closed.

In this application, I have chosen to illustrate my invention as embodied in the basic Unit lock housing originally disclosed in my copending application Serial No. 498,525, field April 1, 1955, and now Patent No. 2,821,849, issued February 4, 1958,-but it will be readily understood that said invention is applicable to other types of door locks without departing from the spirit thereof.

In the drawings, I have attempted to simplify the dis closure of the invention by showing only those parts of the lock which are associated with the present invention.

The basic characteristics of Unit locks are well known' to those familiar with theart and the construction and operation of those elements of the lock which are not shown in detail are conventional and will be readily understood.

Referring now to Fig. 1 of the drawings, the numeral 5 indicates the housing of the lock which is adapted to carry the entire lock mechanism and'is received in a notch 6 extending into the edge of a door 7 in the manner characteristic of Unit locks. The housing 5 is secured in said notch by inner and outer escutcheon plates 8 and 9, respectively, which are clamped against the opposite faces of the door by screws 10 which extend through the inner escutcheon plate 8 and are threaded to the outer plate 9. The housing 5 has a front wall 11,

which is disposed flush with the edge of the door, and

elongated sidewalls 1212 which extend rearwardly therefrom. V

A tubular knob shank bearing sleeve 13 extends transs versely through said side walls adjacent the rear end of the housing and projects through openings in the inner The bearing sleeve'is secured to the housing by pins 1414 which extend 'thereinto from a tie bar 15 that is attached to the side and the outer escutcheon plates.

walls 12-12. The portion of the bearing sleeve 13 between the side walls of the housing contains diametrij cally opposed clearance openings 1616 which are 10- cated'symmetrically with respect to the vertical axis of the sleeve and from the outer edges of which extend diametrically opposed locking notches 17-17 which are located centrally of the clearance openings. 1

The housing 5 carries a latch bolt 18 which is pivotally mounted thereon by, a pin 19 and extends through an opening in the front wall 11. The latch bolt is con nected to a conventional retractor 20 which extends longi tudinally of the housing and includes a yoke portion 20a which straddles the bearing sleeve 13 and has laterally extending arms 20-b20b whose forward faces provide rollback platforms 20-c-20-c. A further detailed description of the retractor is not believed necessary since its construction is conventional, and it is well understood that the retractor and the latch bolt are biased into normal projected, or latching, position, as illustrated in Fig. 1, by a conventional compression spring. The lock mechanism in the housing is protected from dirt and other foreign matter by a dust cover 5-a which is disposed over the open sides of the housing.

The knob shank bearing'sleeve 13 rotatably supports separate inner and outer tubular knob shanks 21 and 22, respectively, .which carry inner and outer knobs 23 and 24. Said knob shanks are retained against axial movement by suitable retaining means, indicated at 25i5, as clearly described in my copending application Serial No.'577,509, filed April 11, 1956. The inner end of the inner knob shank 21 contains a pair of diametrically opposed, radially extending slots 262 6, and the inner end of the outer knob shank contains a pair of similarly arranged slots 2727 which extend to approximately the end of the locking notches 1717 and are normally aligned therewith.

The inner knobshankcarries an inner rollback 23 of conventional form which includes a circular hub portion 28-11, that is disposed within the bore of the inner knob shank, and radially extending arms 28-b-28-b which extend through the slots 2626 in the inner knob shank, through the clearance openings 1616 in the bearing sleeve and over the rollback platforms 20c-20c on the 4 39 on the spindle. The intermediate portion of the tubular section 38 of the spindle is cut away to provide an opening 40 in its periphery. The said spindle also has an elongated portion 41 which is square in cross-section and is spaced from the shoulder 39.

The hub portion of the outer rollback 31 contains a circular opening 42 which slidably and rotatably supports the tubular section 38 at the inner end of the spindle 36. The opening 43 in the hub portion of the intermediate rollback is square and of a size to permit said rollback to be passed over the square portion 41 of the spindle, but said opening is of a smaller size than the tubular section 38 of the spindle so that said intermediate rollback is adapted to abut the shoulder 39 thereon.

The square portion 41 of the spindle is slidably disposed in an opening 44 in the inner rollback. Said opening has parallel side edges which engage opposite sides of said portion 41 and preventrelative rotation of the spinretractor. The slots 2626 in the inner knob shank are of a depth substantially equal to the thickness of the inner rollback and said rollback is held in said slots by a retaining washer 29 that fits within the bearing sleeve 13 and is disposed between the adjacent ends of the inner and the outer knob shanks.

The outer knob shank 22 carries two rollbacks which are identical in shape to the inner rollback. There is an intermediate rollback 30 and an outer rollback 31. The intermediate rollback has a circular hub portion 30-a that is slidably disposed in the bore of the outer knob shank and the radially extending arms 30-b30-b of this rollback extend through the slots 2727 in the outer knob shank and over the rollback platforms 20c-20-c on the retractor. The ends of said arms are cut away to provide outwardly facing, angled, cam surfaces 30-0-30-c thereon which are aligned with retaining pins 32-32 that are carried by the retractor. Said pins are slidably mounted in the arms 20b-20b of the retractor and normally project from the rollback platforms 20c-20-c into the path of the intermediate rollback as best shown in Figs. 4 and 7. The pins are yieldingly held in projected position by compression springs 33-133 that are contained between flanges on the pins and guide fingers 34-34 that are secured to the retractor.

The outer rollback 31 includes a hub portion 31-0 that is also slidably contained in the bore of the outer knob shank and is provided with radially extending arms 31-b31b which project through the slots 2727. in said outer knob shank and overlie the rollback platforms 20c--20c on the retractor; said arms being normally aligned with the locking notches 17-17. The intermediate rollback 30 and the outer rollback 31 are spaced apart by a spacing washer 35 that is contained within the bore of the outer knob shank.

The rollbacks are normally located in the positions shown in Figs. 1, 2 and 4, and it will be understood that when either the inner or the outer knob shank is rotated in either direction, the retractor will be urged to retracted position and the latch bolt will be withdrawn. In the particular lock shown, the retractor is also moved to retracted position upon depression of the latch bolt as it engages the strike when the door is closed.

As previously mentioned, the present lock is provided with two separate and independently operable dogging mechanisms for dogging the outer knob shank againstoperation. The first of these two mechanisms is operable from the inner side of the lock and includes a spindle 36 which is mounted for axial and rotational movement like outer end 37 and a tubular section 38 of greater diameter at its inner'end providing an annularshoulder dle ,and the inner rollback. The ends of said opening 44 are rounded to provide; openings at the opposite sides of said'portion 41 for a pair of diametrically opposed fingers 45--45 extending from a sleeve 46 that fits over the outerend 37 of the spindle. Said fingers extend through the opening in the inner rollback into engagement with the intermediate rollback and hold said intermediate rollback against the shoulder 39 on the spindle. The outer end of the sleeve terminates flush with the outer end of the spindle, as shown in Fig. 2; and the ends of said sleeve and spindle are engaged by a foot 47 of a conventional pushbutton 48 that is mounted for axial sliding movement-in the. inner knob and projects outwardly from the face of theknob. The foot of the pushbutton is pressed against the ends of the sleeve and the spindle by a spring 49, and said foot therefore holds the sleeve and the spindle in assembled relation and against relative movement. It will thus be understood that the intermediate rollback is secured against axial movement with relation to the spindle by the shoulder 39 and the ends of the fingers 4545, but that relative rotation between these two parts is possible since the square opening in the intermediate rollback is located inwardly of the square portion 41 of the spindle.

The outer rollback, the intermediate rollback, the spindle, including the sleeve 46, and the pushbutton are biased toward normal undogging position by spring means including a compression spring 50 that is contained within the outer knob shank between a stationary supporting ring 51 and the outer side of the outer rollback; the re taining washer 29 providing a stop engageable by the intermediate rollback to limit movement of the parts to un dogging position.

A- tubular cam member 52 is mounted to rotate inthe outer knob shank and has-an intermediate portion with opposed fiat sides 5353. Said cam member controls a pair of cylindrical dogging. members 5454 which are movable inradial holes 5555 in the outer knob shank into and out of aligned radial openings 5656 in the bearing sleeve 13. The inner endof the cam member 52 contains spaced holes 57- -57 which are adapted to receive a projection 58 on a positioning disc 59 that is nonrotatably contained within the outer knob shank and serves to position the cam member in either undogging or dogging position. The positioning disc 59 is yieldingly. held against the inner end of the cam member by a compression spring 60 which is disposed against the inner side of the disc and against the adjacent end of the tubular. section 38 of the spindle. Thespring 60 also biases the spindle toward undogging position, but for a purpose which will be hereinafter described.

The outer end of said cam member contains an. axial hole 61 and a portion of the wall of the cam member surrounding: the hole is cut away to provide an arcuate notch 62 in said end. A radial projection 63 is formed on the cam member and extends into a notch 64 in the outer endzofthe-outer knob shank; the-ends of said'notch.

being engaged by said projection to limit rotation of the cam member to 90 degrees.

The outer knob of the lock carries a conventional cyl-' inder lock 65 having a rotatable key plug 66 which is accessible for key operation at the outer face of the knob. Said key plub has a reduced inner end portion 66a which rotatably fits within the hole 61 in the cam member.

An axially extending driving rod 67 is secured to the inner end of the key plug by a pin- 68 which extends through the'key plug and the rod and radially into the notch 62 in said cam member. Said driving rod extends through an axial hole 69 in the cam member and through the positioning disc 59 and into the tubular section 38 of the spindle 36. The inner end of said driving rod carries a radially extending pin 70 which moves within the opening 40 for a purpose to be hereinafter described. It will benoted that the spring 60 is only slightly larger than the driving rod 67 and that said rod therefore retains the spring in position against the end of said tubular section of the spindle. It will be understood from-the above description that a'lost motion connection is provided between the key plug and the cam member 52 and between the key plug and the spindle 36. The first of these lost motion connections is provided by the pin 68 which operates in the notch 62 in the cam member and permits movement of'the key plug and driving rod relatively thereto for approximately 130 degrees. -The second los-t motion connection is provided by the pin 70 on the inner end of the driving rod and the opening 40 in the tubular end of the spindle. This lost motion connection permits approximately 180 degrees of relative movement between .the spindle and the driving rod or the key plug to which it is connected. In addition, the opening 40 in the tubular end of the spindle permits said spindle to move axially relatively to said driving rod.

Figs. 1 to 8 show the lock mechanism in normal unlocked condition and it will be noted that when in this condition, the'pin 70 on the driving rod is located substantially centrally of the opening 40 in the tubular section of the'spindle. The cam member-52 is disposed with its flat sides 53-53 adjacent the dogging members 5454 so that said dogging members are disposed inwardly of the periphery of the outer knob shank, and thespin 68 extending radially from the key plug is disposed against the left end of the notch 62 in said cam member. g

When the inner knob shank is rotated to retract the retractor, the spindle 36 will rotate therewith relatively to the intermediate and the outer rollbacks and the driv ing rod since it is non-rotatably connected to the inner rollback. Said spindle is allowed to rotate for 90 degrees ineither direction relatively to the driving rod 67 through the lost motion connection provided by the pin 70 and the opening 40 so that there will be no interference with the rotation of the spindle at this point.

When the outer knob shank is'rotated, the parts carried thereby will rotate with it and relatively to the spindle and the inner operating mechanism.

When it is desired to dog the outer knob shank against operation from the inner side of the door, it is only necessary to depress thepushbutton 48. This will move the sleeve 46 and the spindle 36 as a unit axially toward the outer side of the lock and relatively to the inner rollback and the driving rod to thereby shift the intermediate rollback and the outer rollback toward the outer side of thelock. As the intermediate rollback moves outwardly, it will depress and ride over the retaining pins 3232 on the retractor. When the intermediate rollback passes said pins, the springs 3333 will return the pins to projected position behind the intermediate rollback, as clearly shown in Fig. 9, to thereby retain said intermediate rollback and. the spindle indogging position. In this position, the arms of the outer rollback are disposed in the locking notches 17-17 .in the bearing sleeve so that operation of'the outer knob shank fromthe outer side of the door is prevented.

If the inner knob shank is rotated from the inner side} I back, to thereby release the intermediate rollback;

whereupon the springs 50 and 60 will return the mechanism to normal undogging position.

If the outer rollback is inadvertently moved into'dog ging position by accidental depression of the pushbutton while the door is open, and the person closing the door while leaving the room turns the outer knob, it will be understood that the outer rollback will be pinched between the outer knob shank and the sides of the locking notches and will therefore be prevented from moving axially to undogging position upon depression of the retractor as the latch bolt engages the strike when the door is closed. If this should occur, the spring 60 willurge the spindle and the intermediate rollback to undogging position, as shown in Fig. 14, independently of the outer rollback, and when the outer knob is released, the spring 50 will then return the outer rollback to its normal un-. dogging position.

If the outer knob is dogged against operation from the inner side of the door, the lock may nevertheless be. operated from the outer side of the door by 'a person possessing the required key, by rotating the key plug with the key in a counterclockwise direction to thereby rotate the driving rod 67. It will be noted from Fig. 5. that the key plug will rotate independently of the cam member 52 due to the lost motion connection therebe-. tween that is provided by the pin 68 and the notch 62. After the key plug and the driving rod have been rotated,

for approximately degrees in a counterclockwise direction, the radially projecting pin 70 on the inner end of the driving rod will engage the edge of theopening 40 in the tubular section of the spindle to establisha driving connection between the driving rod and the; spindle. Further rotation of the key plug will then cause rotation of the spindle in a counterclockwise directionthe parts carried thereby to undogging position, as above described, after which further rotation of the key in a counterclockwise direction will rotate the outer knob; shank to fully retract the latch bolt. Figs. 10 and 11 illustrate the positions of the mechanism when operated as above described.

If it is desired to dog the outer knob shank from the outer side of the door to prevent entry into the room, it is only necessary to rotate the key plug with the proper key in a clockwise direction. Since the pin 68 is normally disposed adjacent the left end of the notch 62 in the cam member, the cam member will immediately start to rotate with the key plug in a clockwise direction and will be moved from the position shown in Figs. 5 and-6 to the position shown in Figs. 12 and 13 wherein the dogging members 54-54 will be urged radially into the openings 5656 in the bearing sleeve to thereby prevent rotation of the outer knob shank. Rotation of the cam member is arrested when it reaches dogging position by engagement of the projection 63 thereon with the end of the notch 64 in the outer knob shank as shown in Fig.

12 which also illustrates the position of the key plug and the pin 68 as the cam reaches dogging position. It will V positioning disc 59 until manually moved out of dogging:

position by key operation of the key plug. In order to return the cam member to undogging position, it is only necessary to rotate the key plug in a counterclockwise direction to move the cam member from the position shown in Fig. 12 to the position which is also shown by Fig. 10. The key plug may then be returned to its normal position, as shown in Fig. 5, independently of the cam member and the key withdrawn.

' I claim:

1. A door lock comprising a housing, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank mounted to rotate in said housing, means operable upon rotation of either of said shanks for actuating said retractor, a first dogging means operable from the inner side of the lock for dogging the outer knob shank against operation, said first dogging means being releasable upon rotation of said inner knob shank, a second dogging means for dogging said outer knob shank against operation, a single key operated member accessible from the outer side of the lock adapted to control said second dogging means, and means providing an operative connection between said key operated member and said inner knob shank whereby said key operated member is adapted to rotate said inner knob shank to release said first dogging means.

2. A door lock comprising a housing, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank mounted to rotate in said housing, rollback means associated With eachof said shanks for ac tuating said retractor, a first dogging means for dogging said outer knob shank against operation, means accessible from the inner side of the lock for moving said first dogging means into dogging position, retaining means for holding said first dogging means in dogging position, said retaining means being movable to release said first dogging means upon rotation of said inner knob shank, means for moving said first dogging means to undogging position upon the release thereof, a second dogging means for dogging said outer knob shank against operation, rotatable key operated means accessible from the outer side of the lock, means connecting said second dogging means to said key operated means for operation thereby, and means connecting said inner knob shank to said key operated means whereby said inner knob shank is adapted to be rotated from the outer side of the lock to release said first dogging means, each of said connecting means including a lost motion connection whereby either the second dogging means or said inner knob shank may be independently operated by said key operated means.

3. A door lock comprising a housing, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank mounted to rotate in said housing, rollback means associated with each of said shanks for actuating said retractor, a first dogging means adapted to dog the outer knob shank against operation, means accessible from the inner side of the lock for moving said first dogging means into dogging position, retaining means for holding said first dogging means in dogging position, said retaining means being movable to release said first dogging means upon rotation of said inner knob shank, means for returning said first dogging means to undogging position upon the release thereof, a second dogging means for dogging said outer knob shank against operation, a rotatable actuating member controlling the movement of said second dogging means into and out of dogging position, rotatable key operated means accessible from the outer side of the lock controlling said actuating member and having a lost motion connection therewith whereby said key operated means is adapted to rotate relatively to said actuating member for a limited distance, means connecting said key operated means to said inner knob shank whereby said shank is adapted to be rotated from the outer side of the lock to release said first dogging means, said connecting means including a lost motion connection permitting, rotation. of said key operated,

8; means relatively to said inner knob shank for a limited distance, said lost motion connections permitting independent operation of said actuating member and said inner knob shank from the outer side of the lock.

4. The subject matter set forth in claim 3 whereinthe lost motion connection between said key operated means and said actuating member permits a greater amount of independent rotation of said key operated means than the lost motion connection between said key operated means and said inner knob shank whereby said inner knob shank may be rotated to release said first dogging means without rotating said actuating member.

5. A door lock comprising a housing having a recess, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank mounted to rotate in said housing and each having a knob secured thereto, a rollback non-rotatably connected to each of said shanks for actuating said retractor, the rollback associated with the outer knob shank being slidable axially thereof into said recess to dog said shank against operation, means operable from the inner side of the lock for shifting said outer rollback into dogging position, retaining means. on said retractor for holding said outer rollback in dogging position, separate dogging means carried by said outer knob shank and adapted to dog said shank against operation, a rotatable actuating member carried by said outer knob shank for controlling the movement of said separate dogging means into and out of dogging position, rotatable key operated means in said outer knob adapted to actuate said actuating member and having a lost motion connection therewith permitting rotation of said key operated means independently thereof for a limited distance, means connecting said key operated means to said inner rollback whereby said inner rollback is adapted to be rotated from the outer side of the lock to retract said retractor and thereby release said outer rollback, said connecting means including, a lost motion connection permitting rotation of said key operated means iridependently of said inner rollback during operation of said actuating member.

6. A door lock comprising a housing having a recess, a retracto'r for a latch bolt movable in said housing, an inner and an outerknob shank mounted to rotate in said housing and eachhaving a knob secured thereto, a rollback non-rotatably connected to each of said shanks for actuating said retractor, the rollback associated with the outer knob shank being slidable axially thereof into said recess to dog said outer shank against rotation, a spindle mounted for axial and rotational movement in said knob shanks, means connecting the outer rollback to said spindle for axial movement therewith, means connecting the inner rollback to said spindle for rotation therewith, a pushbutton projecting from the inner knob adapted, upon depression thereof, to shift said spindle and said outer rollback axially into dogging position, cooperative retaining means on said retractor and said spindle for retaining said spindle and said outer rollback in dogging position, a rotatable key operated member in said outer knob having a lost motion connection with said spindle permitting rotation thereof relatively to said spindle for a limited distance, separate dogging means carried by said outer knob shank and adapted to dog said outer shank against operation, an actuating member rotatably' mounted in said outer knob shank for controlling the movement of said separate dogging means into and out of dogging position, said actuating member having a lost motion connection with said key operated member permitting rotation of said key operated member relatively thereto in one direction when operated to rotate said inner rollback to retract said retractor and thereby release said outer rollback, the lost motion connection between said key operated member and said spindle permitting rotation of said actuating member by said key operated member independently of said spindle when rotated in the opposite direction.

7. A door lock comprising a housing'having a recess, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank mounted to rotate in said housing-and each having a knob secured thereto, a rollback non-rotatably connected to each of said shanks for actuating said retractor, the rollback associated with the outer knob shank being movable axially thereof into said recess to dog said outer knob shank against operation, a spindle member mounted for axial and rotational movement in said knob shanks and extending through said rollbacks, means connecting said outer rollback to said spindle for axial movement therewith, means connecting said inner rollback to said spindle for rotation therewith, a pushbutton extending from the inner knob adapted, upon depression thereof, to shift said spindle and said outer rollback axially relatively to said inner rollback to carry said outer rollback into said recess, cooperative retaining means on said retractor and said spindle for retaining said spindle and said outer rollback in dogging position, a rotatable key operated member contained in said outer knob, a driving member secured to said key operated member and having a lost motion connection with said spindle permitting relative axial and rotational movement thereof, said key operated member being adapted to rotate said inner rollback through said spindle to retract said retractor and thereby release said retaining means, spring means for returning said outer rollback and said spindle to undogging position upon the release thereof, a cam member mounted to rotate in said outer knob shank, dogging means controlled by said cam member for dogging said outer knob shank against operation, said cam member having a lost motion connection with said key operated member permitting independent rotation of said key operated member relatively thereto for a limited distance when rotated in one direction to thereby permit rotation of said spindle by said key operated member independently of said cam member, the lost motion connection between said driving member and said spindle permitting rotation of said cam member independently of said spindle when the key operated member is rotated in the opposite direction to move said second dogging means into dogging position.

8. A door lock comprising a housing having a recess, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank mounted to rotate in said housing and each having a knob secured thereto, a rollback non-rotatably connected to each of said shanks for actuating said retractor, the rollback associated with the outer knob shank being movable axially thereof into said recess to dog said outer knob shank against operation, a spindle member mounted for axial and rotational movement in said knob shanks and extending through said rollbacks, means connecting said outer rollback to said spindle for axial movement therewith, means connecting said inner rollback to said spindle for rotation therewith, a pushbutton extending from the inner knob adapted, upon depression thereof, to shift said spindle and said outer rollback axially relatively to said inner rollback and into dogging position, cooperative retaining means on said spindle and said retractor for retaining said spindle and said outer rollback in dogging position, a cam member mounted to rotate in said outer knob shank, dogging means controlled by said cam member for dogging said outer knob shank against operation, a cylinder lock contained in said outer knob and having a rotatable key plug, a driving rod secured to said key plug and extending axially of said outer knob shank and rotatably through said cam member, said driving rod having a lost motion connection with said spindle permitting relative axial and rotational movement thereof, a driving pin extending radially of said driving rod and into an arcuate notch in said cam member, said notch providing a lost motion connection between said key plug and said cam member permitting 10 rotation of said key plug independentlynhereof when rotated in' one direction whereby said spindle" may be rotated to retract said retractor and thereby release said outer rollback, spring means for returning said outer rollback and said spindle to undogging position, the-lost motion connection bet-Ween said driving rod and said spindle permitting rotation of said cam member by said key plug independently of said spindle when said cam member is operated to move said dogging means into and out of dogging position. Y

9. The subject matter set forth'in claim 8 wherein said driving rod is provided with a radial projection adjacent its inner end and said spindle is provided with a portion overlying the inner end of said driving rod and having an abutment surface engageable with and nor! mally spaced from said projection thus providing said lost motion connection between said driving rod and said spindle permitting relative axial and rotational movement there'between.

10. A doorlock comprising a housing having a recess, a retractor fora latch bolt movable in said housing, an inner and an outer knob shank mounted to rotate in said housing and each having a knob secured thereto, a roll back non-rotatably connected to each of said shanks and adapted to actuate said retractor, the rollback associated with the outer knob shank being slidable axially thereof into said recess to dog said shank against operation, a spindle member mounted for axial and rotational movement in said shanks and extending through said rollbacks, said spindle having a polygonal portion axially slidable in a correspondingly shaped axial opening in said inner rollback, whereby relative rotation of said inner rollback and said spindle is prevented, and a tubular portion extending rotatably through said outer rollback, means securing said outer rollback to said spindle for axial movement therewith, a pushbutton projecting from said inner knob adapted, upon depression thereof, to shift said spindle and said outer rollback axially into dogging position, retaining means on said retractor for retaining said spindle and said outer rollback in dogging position, a cam member mounted to rotate in said outer knob shank, a pair of radially movable dogging members controlled by said cam member and adapted to dog said outer knob shank against operation, a cylinder lock mounted in said outer knob and having a rotatable key plug, a driving rod secured to said key plug and extending axially of said outer knob shank and rotatably through said cam member, said tubular portion on the inner end of the spindle telescopically receiving the inner end of said driving rod and having an opening in its periphery providing angularly spaced edge portions thereon, a pin extending radially from the inner end of said driving rod into said opening whereby a lost motion connection is provided between said spindle and said driving rod permitting relative axial and rotational movement thereof, a driving pin extending radially from said key plug into an arcuate notch in said cam member and normally disposed adjacent one end thereof whereby a lost motion connection is provided between said cam member and said key plug permitting relative rotation therebetween, the lost motion connection between said spindle and said driving rod permitting operation of said cam member independently of said spindle, and the lost motion connection between said key plug and said cam member permitting rotation of said spindle and said inner rollback relatively to said cam member to thereby retract said retractor and release said outer rollback, and spring means for returning said outer rollback and said spindle to undogging position upon the release thereof.

11. A door lock as set forth in claim 10 including an intermediate rollback mounted for axial sliding movement in said outer knob shank and having an axial opening therein through which said spindle extends, said tubular portion of the spindle having a shoulder engageable by said intermediate rollback, a sleeve telescopically received over the outer end of said spindle and having portions extending through the opening in said inner rollback and abutting the intermediate rollback to hold said intermediate rollback against said shoulder whereby said intermediate rollback is secured against axial movement relatively to said spindle and is adapted, upon depression of said pushbutton, to shift said outer rollback into dogging position, said intermediate rollback being engageable with the retaining means on said retractor whereby said spindle and said outer rollback are held in dogging position, said spindle and said intermediate rollback being movable to undogging position independently of said outer rollback when said outer rollback is jammed in dogging position, a spring for moving said spindle and said intermediate rollback to undogging position, and a separate spring for moving the outer rollback inwardly to undogging position independently of said spindle and said intermediate rollback.

12. For a door lock, a spindle unit comprising a combination an elongated spindle member having a tubular section at its inner end that is larger than the outer end of said spindle member thus providing an annular outwardly facing shoulder thereon, said tubular section having an opening in its periphery, a square portion on the outer end of said spindle member spaced outwardly from said shoulder, a sleeve fitting over the outer end of said spindle member and having a pair of fingers extending therefrom over opposite sides of said square portion toward said shoulder, and a driving rod slidably and rotatably fitting into the tubular section of said spindle member and having a radial projection normally disposed in the opening in said tubular section whereby a lost motion connection is provided between the said driving rod and said spindle member permitting relative axial and rotational movement therebetween.

References Cited in the file of this patent UNITED STATES PATENTS 

